Bis(triorganosilyl)phosphate compositions

ABSTRACT

Disiloxy derivatives of fluoroalkyl acid phosphates of the general formula ARE DISCLOSED AS CORROSION INHIBITORS FOR FLUOROSILICONE LUBRICANTS.

United States Patent [151 3,639,239 Groenhol 1 Feb. I, 11972 [54] BIS(TRIORGANQSILYMPHOSPHATE 3,441,585 4/1969 Brown ..252/49.9X

COMPOSITIONS {72] Inventor: Eugene D. Groenhof, Midland, Mich. [73] Assignee: Dow Corning Corporation, Midland, Mich. [221 Filed: Sept. 17, 1969 [2]] Appl. No.: 858,886

[52] U.S. Cl. ..252/49.9, 260/4482 N [51] um. Cl. ...Cl0m1/50,C10rn 1/46 [58] Field of Search ..252/49.9

[56] References Cited UNITED STATES PATENTS 2,843,615 7/1958 Linville ..252/49.9 X 2,963,503 12/1960 Marsden Primary Examiner-Daniel E. Wyman Assistant Examiner-W. Cannon Attarney-Robert F. Fleming, Jr., Lawrence R. Hobey, Harry D. Dingman and Norman E. Lewis [57] ABSTRACT Disiloxy derivatives of fluoroalkyl acid phosphates of the general formula X(CF ),,,(CH2).,OP(OSiCH CH Rflg II are disclosed as corrosion inhibitors for fluorosilicone lubricants.

2 Claims, N0 Drawings in which R, is a perfluoroalkyl radical of no more than 10 carbon atoms;

R is a lower alkyl radical of no more than six carbon atoms or a phenyl radical;

X is a hydrogen or fluorine atom;

n is an integer having a value offrom l to 16; and

m is an integer having a value of from 2 to 24.

As described above, R, can be any perfluoroalkyl radical, such as CF C F and so on thru C ,F The radicals can be straight or branched chain. The same or different R, radicals can be bonded in the same silicon atom.

Thus, included within the scope of the invention are compounds of the formulas u l (CH l l H 2 CH CHF:(CF2)15(CH2) 001|T"O IiCHzCHgCsFu O 1 ciHo 2 and The disiloxy derivatives of the fluoroalkyl acid phosphates are prepared by reacting fluoroalkylphosphoric compounds of the formula X(CF ),,,(CH ),,OPO(OH) with silazanes of the formula R,CH CH R sil NH in a suitable solvent such as ether. The reaction is mildly exothermic. The silazane precurser is prepared by the reaction of ammonia with silanes ofthe formula (R,CH CH )R SiCl. The fluoroalkylphosphoric compounds are well known and are commercially available.

The compounds of the invention are useful as corrosion inhibiting additives to organopolysiloxane fluids. Dimethylpolysiloxanes. phenylmethylpolysiloxanes and trifluoropropylmethylsiloxanes are representative of such siloxanes. Generally, from 0.005 to 5 weight percent concentrations of the disiloxy compounds in the fluids is sufficient to obtain the desired inhibition of corrosion.

The following examples are illustrative and not limiting of the invention. which is properly delineated in the claims.

EXAMPLE I EXAMPLE 2 To demonstrate its utility as a rust inhibitor in lubricants, various amounts of the product of example I were added to 3,3,3-trifluoropropylmethylpolysiloxane which has a viscosity of 300 cs. at 25 C. The inhibitor-containing fluids were tested in accordance with ASTM D 66SA. Test results are listed below:

Concentration of in fluid lubricant (wt. /1) Soluble Results 00] yes pass 005 yes puss 0.10 yes pass 0.20 yes pass l .0 yes pass The fluorosilicone lubricant was tested without the addition of compounds within the scope of the invention and failed the [ESL That which is claimed is:

l. A composition comprising a fluid organopolysiloxane and from 0.005 to 5 weight percent, based on the weight of or ganopolysiloxane, of a composition of the formula xwmmwannol wstonzomnm R, is a perfluoroalkyl radical of no more than 10 carbon atoms;

R is a lower alkyl radical of no more than six carbon atoms or a phenyl radical;

X is a hydrogen or a fluorine atom;

n is an integer having a value offrom l to 16; and

m is an integer having a value offrom 2 to 24.

2. The composition of claim 1 wherein the organopolysiloxane is 3,3,3-trifluoropropylmethylpolysiloxane.

=l i =l= 

2. The composition of claim 1 wherein the organopolysiloxane is 3,3,3-trifluoropropylmethylpolysiloxane. 